Normalize Portuguese earthquake data schema

[nagcas]

Overview

Convert Portuguese earthquake data into the TerraQuake unified earthquake model.

Standard Fields

Required:

• eventId
• magnitude
• magnitudeType
• latitude
• longitude
• depth
• location
• country
• region
• timestamp
• source

Additional Fields

• originalProvider
• originalEventId
• rawData

Acceptance Criteria

• Portugal events match TerraQuake schema
• Existing frontend requires no changes